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Removing all subtitles from a media file

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ffmpeg -i input.mkv -map 0 -map -0:s -codec copy output.mkv

• -map input_file_index:stream_type_specifier:stream_index
• -map 0 -map -0:s to map all the streams except subtitles streams from input 0, use negative mapping.
• -codec copy select stream copy mode for the -codec option. This omits decoding and encoding of selected streams.

Adding subtitles to a media file

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ffmpeg -i input.mkv -i input.srt -map 0 -map 1:s:0 -codec -copy -metadata:s:s:0 langauge=chi output.mkv

• -map 1:s:0 specifying stream index of #1 input file
• -metadata:s:s:0 langauge=chi -metadata[:metadata_specifier] key=value. first s is a stream specifier. second s is a subtitle specifier. 0 is the stream index.

reference

Map - ffmpeg

check ip address with AWS

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curl https://checkip.amazonaws.com

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• Item 1
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1. Item 1
2. Item 2
3. Item 3
   1. Item 3.1

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Code block

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let message = 'Hello world';
console.log(message);

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